An Evolution in Terrorism in international relations

Terrorism is one of the most debateful notions considering its definition. It is studied inter-disciplinarily. In other words, in studding terrorism, different fields like politics, international relations, international law, psychology, sociology and some others should be taken into account. This article discusses the nature and essence of terrorism and its evolution in international relations from 19th century to the present time. This study is done based on eight factors: stimulus, analysis pattern, organization, strategy, tactics, goals, weapons, and victims. The writer believes that in 21st century the international terrorism has changed to the global terrorism because it is territory-free now.